Dishwasher Self-Sealing Vent Fan Using Motor-Driven Door Actuation
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Solution Overview
Problem
Dishwashers face challenges in reducing noise and ensuring effective venting during the drying cycle, as existing venting systems often require separate actuators for the fan and vent door, leading to increased noise and potential water leakage.
Innovation Solution
A vent door mechanism that uses the energy of the blower fan to mechanically open and close the vent, eliminating the need for a separate actuator and providing improved sealing and sound damping through direct mechanical coupling with the fan motor, allowing for both airflow and water tightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a separate actuator is used for the vent door, then the fan and vent door can be controlled independently, but the device complexity increases and noise increases
Solution Approach 1:
The patent combines the fan motor and vent door actuator into a single integrated unit. The motor serves dual functions: driving the fan blades for air circulation and, through direct mechanical coupling, actuating the vent door. This eliminates the need for separate actuators while maintaining functional independence through electronic control of the single motor.
Solution Approach 2:
The single motor is designed to perform multiple functions: it acts as both the fan driver and the vent door actuator. By coupling the motor shaft directly to both the fan blades and the vent door mechanism, one component fulfills the roles previously requiring two separate components, reducing overall system complexity.
2Device complexity
If air pressure is used to open the vent door, then no separate actuator is needed, but back pressure reduces airflow efficiency
Solution Approach 1:
The motor is directly coupled to both the fan and vent door mechanisms, combining previously separate functions into one integrated drive system. This mechanical integration allows the motor to provide sufficient torque for both fan operation and door actuation without creating back pressure that would compromise airflow efficiency.
3Reliability
If the vent door is sealed tightly for water tightness, then water leakage is prevented, but acoustic damping is reduced
Solution Approach 1:
The vent door incorporates different material properties in different regions: a rigid portion for structural integrity and water sealing, and a resilient portion for acoustic damping. This local differentiation allows the door to simultaneously achieve water tightness through the rigid seal and noise reduction through the resilient material's vibration absorption capabilities.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution reduces noise and water leakage by using a single electrical actuator for both fan operation and vent control, enhancing drying efficiency and acoustic damping while maintaining water tightness.
Implementation Method 1
a blower to increase the passage of air through the washing volume... arranged to reinforce the natural convective flow of air
Implementation Method 2
activation of a heating element exposed at the bottom of the washing volume to heat the dishes and create an upward convective flow of hot air
Data Source
AI summary
A vent fan for use with the dishwasher and providing a vent door covering the opening associated with a motorized fan employs a mechanical coupling between the fan motor and vent door to eliminate the need for a separate vent door actuator by using energy of the fan motor to accomplish the actuation.